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What is the hardness of the quartz minerals?

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in Engineering Geology by (962k points)
What is the hardness of the quartz minerals?

(a) 7

(b) 6

(c) 2

(d) 4

This question was addressed to me by my college professor while I was bunking the class.

This intriguing question comes from Formation and Descriptive Study of Minerals topic in portion The Study of Minerals of Engineering Geology

1 Answer

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Right answer is (a) 7

To explain I would say: The hardness is almost the same for all the quartz minerals and is about 7. This is one of the advantages of the quartz as they have high hardness.

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